dede网站建站教程/微信投放广告多少钱

最近在一个QQ群里，看到有人在做一个需求，要能实现头像的聚合拼接，我本来是想的生成一个bitmap，有人说起来要用drawable实现，其实算法是一样的，只是用法不一样而已，我就顺便学一下自定义drawable来做。

先看效果：

就是这样了，思路应该就是一个圆形的imageview，加载上对应的bitmap或者drawable即可。

drawable的代码如下：

public class SliceDrawable extends Drawable {private List<Bitmap> src ;private Paint paint;public SliceDrawable(List<Bitmap> srcs) {if (srcs == null || srcs.size() == 0){throw  new IllegalStateException("bitmaps cannot be null or empty");}src = srcs;paint = new Paint();paint.setAntiAlias(true);}@Overridepublic void draw(Canvas canvas) {Bitmap bitmap = null;Rect rect = getBounds();switch (src.size()){case 1:bitmap = src.get(0);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),rect,paint);break;case 2:bitmap = src.get(0);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),rect,paint);bitmap = src.get(1);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getRigtBitmapBound(),paint);break;case 3:bitmap = src.get(0);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),rect,paint);bitmap = src.get(1);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getRightTopBound(),paint);bitmap = src.get(2);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getRightBottomBound(),paint);break;case 4:bitmap = src.get(0);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getLeftTopBound(),paint);bitmap = src.get(1);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getRightTopBound(),paint);bitmap = src.get(2);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getRightBottomBound(),paint);bitmap = src.get(3);canvas.drawBitmap(bitmap,getBitmapBound(bitmap),getLeftBottomBound(),paint);break;default://多于4张，那么平分绘图区域？break;}}private Rect getBitmapBound(Bitmap bitmap){return  new Rect(0,0,bitmap.getWidth(),bitmap.getHeight());}private Rect getLeftTopBound(){Rect rect = getBounds();return new Rect(rect.left,rect.top,rect.centerX(),rect.centerY());}private Rect getRightTopBound(){Rect rect = getBounds();return new Rect(rect.centerX(),rect.top,rect.right,rect.centerY());}private Rect getRightBottomBound(){Rect rect = getBounds();return new Rect(rect.centerX(),rect.centerY(),rect.right,rect.bottom);}private Rect getLeftBottomBound(){Rect rect = getBounds();return new Rect(rect.left,rect.centerY(),rect.centerX(),rect.bottom);}private Rect getRigtBitmapBound(){Rect rect = getBounds();return new Rect(rect.centerX(),0,rect.right+rect.centerX(),rect.bottom);}@Overridepublic void setAlpha(int alpha) {}@Overridepublic void setColorFilter(ColorFilter colorFilter) {}@Overridepublic int getOpacity() {return 0;}
}

因为要求就是最多四张图片显示，所以更多的就没有写，如此加载到圆形的Imageview中即可达到上图的效果。